Two things:
1 under H&S rules you can't walk up or down a stalled escalator because the "steps" change height at the top and bottom, and in the middle are too high to be called steps anyway. And remember those passengers having to carry "wheely" carry-on bags up stairs instead of pulling them and standing still on a moving escalator.
2 the night flights thing is a con. The real motive is not "we want to be a good neighbour" but could be "we can't/won't afford to staff the place at night for just a few flights". Or maybe they're softening up the neighbours to ease the ride to get the masterplan adopted to concrete over more of Cheshire and demolish the B&Q oops I mean cargo centre. Alternatively, under their noise points scheme, one banned noisy flight could mean up to 16 permitted quiet ones so it's a con to get more "quiet" flights. Either way, you won't get the truth out of MA's ministry of propaganda.